CN110290616B - LED calibration method, device and storage medium - Google Patents
LED calibration method, device and storage medium Download PDFInfo
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- CN110290616B CN110290616B CN201910608672.3A CN201910608672A CN110290616B CN 110290616 B CN110290616 B CN 110290616B CN 201910608672 A CN201910608672 A CN 201910608672A CN 110290616 B CN110290616 B CN 110290616B
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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Abstract
The invention discloses an LED calibration method, an LED calibration device and a storage medium, wherein the method comprises the steps of detecting the actual brightness value of an LED when each color is lightened at a first duty ratio; determining a brightness proportion corresponding to each color according to the actual brightness value and the target brightness value of each color respectively; and determining the duty ratio corresponding to each color according to the brightness ratio and the second duty ratio. According to the invention, the brightness obtained after mixing reaches the target brightness through the brightness adjustment of each single color of the LED, and the scheme of automatically calibrating the LED brightness avoids errors caused by manual detection and improves the accuracy of the factory detection of the LED.
Description
Technical Field
The invention relates to the technical field of LEDs, in particular to an LED calibration method, an LED calibration device and a storage medium.
Background
The LED is widely applied to various products at present, the brightness of each LED is inconsistent due to assembly and material difference of each product, the product is in a problem when the LED is finally installed on the product, the brightness of the LED is usually judged manually after the LED is lightened by the existing LED factory brightness detection, the LED is directly recycled when the brightness is abnormal, and the manual judgment accuracy is low.
Disclosure of Invention
The invention mainly aims to provide an LED calibration method, an LED calibration device and a storage medium, and aims to solve the technical problem of low accuracy in manual LED brightness detection in the prior art.
In order to achieve the above object, the present invention provides an LED calibration method, including the steps of:
detecting an actual brightness value at which the LED lights up each color at a first duty ratio;
determining a brightness proportion corresponding to each color according to the actual brightness value and the target brightness value of each color respectively;
and determining the duty ratio corresponding to each color according to the brightness ratio and the second duty ratio.
Optionally, before the step of determining the duty ratio corresponding to each color according to the brightness ratio and the second duty ratio, the LED calibration method further includes:
determining a reference duty ratio corresponding to each color value according to the brightness proportion corresponding to each color value and the first duty ratio;
determining a maximum value of each of the reference duty cycles as a second duty cycle.
Optionally, the step of determining the duty ratio corresponding to each color according to the brightness ratio and the second duty ratio includes:
acquiring the maximum brightness proportion in each brightness proportion;
setting the duty ratio of the color corresponding to the maximum brightness ratio as the second duty ratio, and acquiring target colors except the color corresponding to the maximum brightness ratio;
and calculating the duty ratio of each target color according to the brightness ratio and the maximum brightness ratio of each target color and the second duty ratio.
Optionally, the step of calculating the duty ratio of each target color according to the brightness ratio of each target color, the maximum brightness ratio and the second duty ratio includes:
calculating the difference between the maximum brightness ratio and the brightness ratio of each target color to obtain the brightness ratio difference corresponding to each target color;
obtaining a duty ratio difference value according to the brightness ratio difference and the second duty ratio;
and determining the duty ratio corresponding to the target color according to the duty ratio difference value of each target color and the second duty ratio.
Optionally, the step of determining the brightness ratio corresponding to each color according to the actual brightness value and the target brightness value of each color respectively includes:
acquiring a brightness difference between a target brightness value and the actual brightness value of each color;
the ratio between the luminance difference of each color and the target luminance value is calculated as the luminance ratio.
Optionally, after the step of determining the duty ratio corresponding to each color according to the brightness ratio and the first duty ratio, the LED calibration method further includes:
storing the first duty cycle and the duty cycle corresponding to each color.
Optionally, the target brightness value of each color is an average value of actual brightness when a preset number of LED test samples are lit at the first duty cycle.
In addition, to achieve the above object, the present invention further provides an LED calibration device, which includes a memory, a processor, and an LED calibration program stored in the memory and executable on the processor, wherein the LED calibration program, when executed by the processor, implements the steps of the LED calibration method as described above.
Furthermore, to achieve the above object, the present invention further provides a computer readable storage medium, wherein the computer readable storage medium stores thereon an LED calibration program, and the LED calibration program, when executed by a processor, implements the steps of the LED calibration method as described above.
According to the LED calibration method provided by the invention, the actual brightness value of the LED when each color is lightened at the first duty ratio is detected, the brightness proportion corresponding to each color is determined according to the actual brightness value and the target brightness value of each color, the duty ratio corresponding to each color is determined according to the brightness proportion and the first duty ratio, and the brightness obtained after mixing reaches the target brightness through the brightness adjustment of each single color of the LED.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating an embodiment of a method for calibrating an LED according to the present invention;
FIG. 2 is a functional block diagram of the LED calibration device of the present invention;
FIG. 3 is a schematic flow chart of another embodiment of the LED calibration method of the present invention;
fig. 4 is a schematic detailed flow chart of obtaining the duty ratio of each color in an embodiment of the LED calibration method of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of an LED calibration method according to the present invention. In this embodiment, the LED calibration method includes the steps of:
s10, detecting the actual brightness value of the LED when each color is lighted at the first duty ratio;
the first duty ratio is a preset duty ratio value, the first duty ratio can be determined according to product specifications, the first duty ratios corresponding to different products are different, and the lighted colors are three primary colors, namely R (red), G (green) and B (blue); the three primary colors to be lit can be determined by the colors of the LEDs, for example, when the LEDs emit orange light, the colors to be lit only need to include red and green, and when the LEDs emit white light, the colors to be lit need to include three colors of R (red), G (green), and B (blue). The actual brightness value is detected by a brightness detection device, each color can be lit up separately, and the brightness is detected by a brightness detection device provided near the LEDs.
S20, determining the brightness proportion corresponding to each color according to the actual brightness value and the target brightness value of each color respectively;
the target brightness value is the target brightness which the LED needs to reach, the target brightness can be set by a user, and the target brightness which the LED needs to reach is directly set; the actual brightness of the LEDs can also be obtained, namely the target brightness value of each color is the average value of the actual brightness when a preset number of LED detection samples are lightened at the first duty ratio, the target brightness value is made to be a brightness value that can be achieved by all the LEDs, and the specific manner of obtaining the target brightness value is that a preset number of LEDs are lit up in red, the actual brightness of each LED is detected, the average value of each actual brightness is calculated as the target brightness value of red, then lighting up a preset number of LEDs with green, detecting the actual brightness of each LED, calculating the average value of each actual brightness as the target brightness value of green, then lighting up a preset number of LEDs with blue, detecting the actual brightness of each LED, calculating the average value of each actual brightness as the target brightness value of blue, the detection order of R, G and B may be set as necessary, and is not limited to the above detection order.
The proportional relation between the actual brightness and the target brightness can be determined according to the brightness proportion between the actual brightness and the target brightness, the duty ratio can be corrected according to the proportional relation, and brightness compensation is achieved so that the actual brightness can reach the target brightness.
And S30, determining the duty ratio corresponding to each color according to the brightness proportion and the second duty ratio.
And the duty ratio of each color contrast can be distributed according to the second duty ratio and the brightness proportion, so that the target brightness can be achieved after the duty ratio of each color is adjusted.
According to the LED calibration method provided by the embodiment, the actual brightness value of the LED when the LED lights each color at the first duty ratio is detected, the brightness proportion corresponding to each color is determined according to the actual brightness value and the target brightness value of each color, the duty ratio corresponding to each color is determined according to the brightness proportion and the second duty ratio, and the brightness obtained after mixing reaches the target brightness through the brightness adjustment of each single color of the LED.
Referring to fig. 2, fig. 2 is a schematic diagram of functional modules of the LED calibration device according to the present invention. The LED calibration device can be a PC or other special detection terminal, and at least includes a brightness detection module 110, a processor 120, and a memory 130, wherein the memory 130 stores a control system and an LED calibration program; the first duty ratio may be manually set by a user or may be previously stored in the memory.
It is understood that the LED calibration device may further include a communication module, and the LED calibration device may communicate with the LED through the communication module to transmit the duty ratio after calibration to the LED for saving, and the LED may also store the first duty ratio therein.
Referring to fig. 3, in an embodiment, before step S30 in fig. 1, the method further includes:
step S40, determining a reference duty cycle corresponding to each color value according to the brightness proportion corresponding to each color value and the first duty cycle;
the luminance ratio may be calculated in various ways, for example, step S20 includes: acquiring a brightness difference between a target brightness value and the actual brightness value of each color; calculating a ratio between the luminance difference of each color and the target luminance value as the luminance ratio, and then calculating a specific luminance ratio according to a calculation formula: k is (Lm-Ls)/Lm, where Ls is an actual luminance value, Lm is a target luminance value, and K is a luminance ratio, and a corresponding luminance ratio between the actual luminance and the target luminance corresponding to each color is calculated, respectively. The corresponding calculation formula of the corresponding reference duty ratio is specifically PMVc＝K×PWM1+PWM1K is the brightness ratio, PWM1At a first duty cycle, PMVcSubstituting the reference duty ratio into the proportional relation and the first duty ratio corresponding to each color to obtain a reference duty ratio R (PMV) of redc) Green reference duty cycle G (PMV)c) And a reference duty cycle B (PMV) for bluec)。
Alternatively, step S20 includes: obtaining a ratio between the actual brightness value and the target brightness value of each color as the brightness ratio, wherein a calculation formula of the brightness ratio is as follows: and K is LS/Lm, wherein LS is an actual brightness value, Lm is a target brightness value, and K is a brightness ratio, and the corresponding brightness ratio between the actual brightness corresponding to each color and the target brightness is respectively calculated. The reference duty ratio corresponds to a calculation formula, specifically, PMVc＝2PWM1-PWM1K, K being the ratio of the brightness, PWM1At a first duty cycle, PMVcSubstituting the reference duty ratio into the proportional relation and the first duty ratio corresponding to each color to obtain a reference duty ratio R (PMV) of redc) Green reference duty cycle G (PMV)c) And a reference duty cycle B (PMV) for bluec)。
Step S50, determining the maximum value of each of the reference duty cycles as a second duty cycle.
And obtaining the distribution proportion of the duty ratio corresponding to each color according to the brightness proportion and the second duty ratio.
According to the technical scheme disclosed by the embodiment, the duty ratios of the colors are directly distributed by referring to the maximum duty ratio in the duty ratios, the calculation process is simple, and meanwhile, the maximum duty ratio is used as the setting basis of the duty ratios, so that the requirements of the duty ratios corresponding to the colors can be met.
It will be appreciated that in other variations the second duty cycle may be set manually by the user, for example the second duty cycle may be 255 for maximum duty cycle, or other values, depending on the type of LED or the need.
Referring to fig. 4, fig. 4 is a detailed schematic diagram of step S30 in the embodiment corresponding to fig. 1, in this embodiment, step S30 includes:
step S31, acquiring a maximum luminance ratio of each of the luminance ratios;
for example, when the luminance ratio Kr of red is 0, the luminance ratio kb of blue is 0.07, and the luminance ratio Kg of green is 0.01, the maximum luminance ratio is kb.
Step S32, setting the duty ratio of the color corresponding to the maximum luminance ratio as the second duty ratio, and acquiring a target color other than the color corresponding to the maximum luminance ratio;
when the maximum luminance ratio is kb, the duty ratio corresponding to blue is set to a second duty ratio, for example, R (PMV)c)、G(PMVc) And B (PMV)c) Maximum value in (1) is R (PMV)c) Then the duty cycle PMvb corresponding to kb is set to R (PMV)c)。
Step S33, calculating a duty ratio of each target color according to the luminance ratio of each target color, the maximum luminance ratio, and the second duty ratio.
Specifically, the step of calculating the duty ratio of each target color according to the luminance proportion of each target color, the maximum luminance proportion, and the second duty ratio includes:
calculating the difference between the maximum brightness ratio and the brightness ratio of each target color to obtain the brightness ratio difference corresponding to each target color;
obtaining a duty ratio difference value according to the brightness ratio difference and the second duty ratio;
and determining the duty ratio corresponding to the target color according to the duty ratio difference value of each target color and the second duty ratio.
The formula for calculating the duty ratio of the target color is PMVm ═ PMVmax-PMVmax (Kmax-Km) ], Km is the luminance ratio of the target color, PMVm is the duty ratio of the target color, PMVmax is the second duty ratio, and Kmax is the maximum luminance ratio.
The above calculation process is described below by way of example, when the duty ratio of blue is set as the second duty ratio, m in the above formula may be replaced by r or g to calculate, for example, PMVr ═ PMVmax-PMVmax (Kmax-kr) ], PMVr is the duty ratio of red, kr is the proportionality coefficient of red, green is similarly PMVg ═ PMVmax-PMVmax (Kmax-kg) ], PMVg is the duty ratio of green, and kr is the proportionality coefficient of green.
In the above embodiment, after the duty ratios corresponding to the respective colors are obtained, the first duty ratio and the duty ratio corresponding to each color are stored, so that the control is performed according to the pre-stored duty ratios when the LED lamp is subsequently turned on.
The following describes the calibration process with specific data to facilitate understanding of the above technical solution, which is specifically as follows:
the LED lamps are respectively lighted up with red, green and blue with the duty ratio PMW1, the actual brightness when the detected LEDs are respectively red, green and blue is LSr, LSg and LSb in sequence, and the target brightness corresponding to red, green and blue is Lmr, Lmg and Lmb in sequence, then the brightness ratio corresponding to red is Kr-Lmr-LSr/Lmr, the brightness ratio corresponding to green is Kg-Lmg-LSg/Lmg, the brightness ratio corresponding to blue is Kb-Lmb-LSb/Lmb, then the reference duty ratio corresponding to red is R (PMV)c)＝Kr×PWM1+PWM1Green corresponds to a reference duty cycle of G (PMV)c)＝Kg×PWM1+PWM1Blue corresponds to a reference duty cycle of B (PMV)c)＝Kb×PWM1+PWM1Taking the maximum of the three duty cycles, for example, if the duty cycle of blue is maximum, the reference duty cycle of blue is set as the second duty cycle, and the duty cycle PMVb when the LED is finally blue is B (PMV)c) And the duty ratio corresponding to red is PMVr ═ PMVmax-PMVmax (Kmax-kr)]The green color corresponds to a duty cycle of PMVg ═ PMVmax-PMVmax (Kmax-kg)]After obtaining PMVr, PMVg, and PMVb, PMVr, PMVg, PMVb, and PMV1 are stored in association with each other.
The present invention further provides an LED calibration apparatus, in an embodiment, the LED calibration apparatus includes a memory, a processor, and an LED calibration program stored on the memory and executable on the processor, and when executed by the processor, the LED calibration program implements the steps of the LED calibration method according to the above embodiments.
The present invention also proposes a computer readable storage medium having stored thereon a LED calibration program, which when executed by a processor implements the steps of the LED calibration method as described in the above embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, a controlled terminal, or a network device) to execute the method of each embodiment of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. An LED calibration method, characterized in that the LED calibration method comprises the following steps:
detecting an actual brightness value when the LED lights each color with a first duty ratio;
determining a brightness proportion corresponding to each color according to the actual brightness value and the target brightness value of each color respectively;
determining a duty ratio corresponding to each color according to the brightness ratio and the second duty ratio;
the step of determining the duty ratio corresponding to each color according to the brightness ratio and the second duty ratio includes:
acquiring the maximum brightness proportion in each brightness proportion;
setting the duty ratio of the color corresponding to the maximum brightness ratio as the second duty ratio, and acquiring target colors except the color corresponding to the maximum brightness ratio;
and calculating the duty ratio of each target color according to the brightness ratio and the maximum brightness ratio of each target color and the second duty ratio.
2. The LED calibration method of claim 1, wherein prior to the step of determining a duty cycle for each color based on the brightness ratio and a second duty cycle, the LED calibration method further comprises:
determining a reference duty ratio corresponding to each color value according to the brightness proportion corresponding to each color value and the first duty ratio;
determining a maximum value of each of the reference duty cycles as a second duty cycle.
3. The LED calibration method of claim 1, wherein said step of calculating a duty cycle for each of said target colors based on a luminance proportion for each target color, a maximum luminance proportion, and said second duty cycle comprises:
calculating the difference between the maximum brightness ratio and the brightness ratio of each target color to obtain the brightness ratio difference corresponding to each target color;
obtaining a duty ratio difference value according to the brightness ratio difference and the second duty ratio;
and determining the duty ratio corresponding to the target color according to the duty ratio difference value of each target color and the second duty ratio.
4. The LED calibration method of claim 1, wherein the step of determining the brightness ratio corresponding to each color according to the actual brightness value and the target brightness value of each color respectively comprises:
acquiring a brightness difference between a target brightness value and the actual brightness value of each color;
the ratio between the luminance difference of each color and the target luminance value is calculated as the luminance ratio.
5. The LED calibration method of any of claims 1-4, wherein after the step of determining a duty cycle for each color based on the brightness ratio and a second duty cycle, the LED calibration method further comprises:
storing the first duty cycle and the duty cycle corresponding to each color.
6. The LED calibration method of any of claims 1-4, wherein the target brightness value for each of the colors is an average of actual brightness when a preset number of LED test samples are lit at the first duty cycle.
7. An LED calibration device, comprising a memory, a processor, and an LED calibration program stored on the memory and executable on the processor, the LED calibration program when executed by the processor implementing the steps of the LED calibration method according to any one of claims 1-6.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a LED calibration program, which when executed by a processor implements the steps of the LED calibration method according to any one of claims 1-6.
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| CN111083834B (en) * | 2019-12-30 | 2022-06-03 | 歌尔科技有限公司 | LED calibration method, device, equipment and system |
| CN112348906B (en) * | 2021-01-07 | 2021-04-06 | 卡莱特（深圳）云科技有限公司 | Method and device for recommending brightness loss percentage in LED screen correction process |
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